Evaluation of the performance of register data as indicators for dairy herds with high lameness prevalence

Table 5 Results of stepwise addition of indicators given by the area under the curve (AUC), model fit by Akaike Information Criterion (AIC) and test for significant increase in model AUC (P-value) compared to the random curve

Indicators	AUC	P-value
Random curve	0.5	–
Cow mortality	0.76	0.03
Cow mortality + BMSCC	0.76	0.18
Cow mortality + BMSCC + lean cows at slaughter	0.78	0.76
Cow mortality + BMSCC + lean cows at slaughter + SD age at first calving	0.78	0.65

Indicators: Cow mortality = annual mean mortality rate per 100 cow years; BMSCC = bulk milk somatic cell count; lean cows at slaughter = proportion of cows per herd with a fat score 1 at slaughter; SD age at first calving = standard deviation of age at first calving

ISSN: 1751-0147